Catamaran sailboat



FIG. 1 is a top perspective view of a catamaran sailboat showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image of that shown;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a catamaran sailboat, as shown and described. 